http://demos.telerik.com/aspnet-ajax/editor/examples/overview/defaultcs.aspx
Clear content;
Add a table;
Open context menu by selecting a cell in the table;
Open Cell Properties;
Open More cell Styling;
Chose Background color;
Change it and click OK
Click OK in Table Wizard.
Actual: No background color is applied. 

Test Environment:

OS: Windows_11

Tool: Colour Contrast Analyser (Version 3.1.2)                                                                                                                                                                                                                                                                                                                                                                                                                                        Repro Steps:                                                                                                                                                                                                                                                                                                                                                                                                                                                                              1. 1.Open URL: https://demos.telerik.com/aspnet-ajax/datepicker/overview/defaultcs.aspxpage in Edge Browser.

Actual Behavior:

Luminosity contrast ratio for 'selected date' on Calander is 1.6:1 which is less than 4.5:1.

Expected Behavior:

Contrast ratio for the text must be greater than or equal to 4.5:1.                                         

For the time being you can set the types through the kendoWidget:
		<telerik:RadCodeBlock ID="RadCodeBlock1" runat="server">
			<script>
				function pageLoad() {
					var chart = $find('<%=RadHtmlChart1.ClientID%>');
					chart._chartObject.options.series[0].type = "verticalLine";
					chart.repaint();
				}
			</script>
		</telerik:RadCodeBlock>
		<telerik:RadHtmlChart runat="server" ID="RadHtmlChart1" Width="600px" Height="400px">
			<PlotArea>
				<Series>
					<telerik:LineSeries Name="Product 1">
						<SeriesItems>
							<telerik:CategorySeriesItem Y="15000" />
							<telerik:CategorySeriesItem Y="23000" />
							<telerik:CategorySeriesItem Y="10000" />
						</SeriesItems>
					</telerik:LineSeries>
				</Series>
				<XAxis>
					<Items>
						<telerik:AxisItem LabelText="1" />
						<telerik:AxisItem LabelText="2" />
						<telerik:AxisItem LabelText="3" />
					</Items>
				</XAxis>
			</PlotArea>
			<ChartTitle Text="Product sales for 2011">
			</ChartTitle>
			<Legend>
				<Appearance Position="Bottom" />
			</Legend>
		</telerik:RadHtmlChart>

For the time being the function can be set through the kendoWidget:
ASPX:
		<telerik:RadScriptManager ID="RadScriptManager1" runat="server"></telerik:RadScriptManager>
		<script>
			function pageLoad() {
				var chart = $find("<%=RadHtmlChart1.ClientID%>");
				chart._chartObject.options.series[0].markers.type = function (point) {
					if (point.value > 2) {
						return "triangle";
					}
					else {
						return "circle";
					}
				};
				chart.repaint();
			}
		</script>
		<telerik:RadHtmlChart runat="server" ID="RadHtmlChart1" Width="600px" Height="400px">
			<PlotArea>
				<Series>
					<telerik:LineSeries Name="Product 1">
						<SeriesItems>
							<telerik:CategorySeriesItem Y="1" />
							<telerik:CategorySeriesItem Y="2" />
							<telerik:CategorySeriesItem Y="3" />
						</SeriesItems>
					</telerik:LineSeries>
				</Series>
				<XAxis>
					<Items>
						<telerik:AxisItem LabelText="1" />
						<telerik:AxisItem LabelText="2" />
						<telerik:AxisItem LabelText="3" />
					</Items>
				</XAxis>
			</PlotArea>
			<ChartTitle Text="Product sales for 2011">
			</ChartTitle>
			<Legend>
				<Appearance Position="Bottom" />
			</Legend>
		</telerik:RadHtmlChart>

I suggest to allow developers to customize the GridColumnGroup header. 

Custom column group headers should be a built-in feature of the RadGrid.

Test Environment:

Test Environment:

Test Environment:

Deleting of a table by delete or backspace key does not work when the selection contains only the table.
Steps to reproduce:
1. Set the following content
<p>test p1</p>
<table>
    <tbody>
        <tr>
            <td>test</td>
            <td>test</td>
        </tr>
    </tbody>
</table>
<p>test p2</p>

2. Select the table only and press delete or backspace key

Actual: Only the content has been deleted.
Expected: The table and its content to be deleted.

Workaround:
<telerik:RadEditor ID="RadEditor1" runat="server">
</telerik:RadEditor>

<script type="text/javascript">
	(function () {
		var $T = Telerik.Web.UI;
		var utils = $T.Editor.Utils;

		var isTableSelected = function (selected) {
			if (utils.isTag(selected, "table")) {
				return true;
			}
			var table = utils.getElementParentByTag(selected, "TABLE");
			return table && !!utils.getElementParentByCondition(selected, function (current) {
				return utils.isAncestorOrSelf(table, current) && utils.isSingleChild(current);
			});
		};

		// Fix for delete table by delete or backspace key
		var formatFragments = $T.Editor.DeleteSelectionCommand.prototype.formatFragments;
		$T.Editor.DeleteSelectionCommand.prototype.formatFragments = function (fragments) {
			var cmd = this;
			var selected = cmd.get_editor().getSelectedElement();

			if (isTableSelected(selected) && fragments.length) {
				var table = utils.isTag(selected, "table") ? selected : utils.getElementParentByTag(selected, "TABLE");
				var $table = $telerik.$(table);
				var data = $table.find("th,td");
				var firstCell = data.first().get(0);
				var lastCell = data.last().get(0);
				var firstFragment = fragments[0];
				var lastFragment = fragments[fragments.length - 1];
				var firstSelected = firstFragment.nodes[0];
				var lastSelected = lastFragment.nodes[lastFragment.nodes.length - 1];

				if ((firstSelected == firstCell || firstSelected == firstCell.firstChild || cmd.isMarker(firstCell.firstChild)) &&
					(lastSelected == lastCell || lastSelected == lastCell.lastChild)) {
					$table.find("." + cmd.getMarkersCssClass()).insertBefore(table);
					$telerik.$(table).remove();
					return;
				}
			}
					
			formatFragments.call(cmd, fragments);
		};

		// Fix for select and delete a table by the DomInspector in Chrome
		var Modules = $T.Editor.Modules;
		if (Modules && Modules.RadEditorDomInspector) {
			var removeSelectedElement = Modules.RadEditorDomInspector.prototype.removeSelectedElement;
			Modules.RadEditorDomInspector.prototype.removeSelectedElement = function (element) {
				if (isTableSelected(element)) {
					element = utils.isTag(element, "table") ? element : utils.getElementParentByTag(element, "TABLE");
				}
				removeSelectedElement.call(this, element);
			};
		}
	})();
</script>

Please follow these steps to reproduce the issue:

1. Open RadEditor Demo: https://demos.telerik.com/aspnet-ajax/editor/examples/overview/defaultcs.aspx
2. Choose a word that is present in the text (e.g. "Barcelona").
3. Open "Find And Replace" dialog.
4. Click on the "Replace" tab.
5. Write "Barcelona" or any other chosen word in the "Find" field.
6. Write something in the "Replace With" field (e.g. "Replacement").
7. Select the "Up" Direction in "Search Options".
8. Click "Replace All".

Actual Result: The "The search string was not found." message is displayed and the substrings ("Barcelona") are not replaced.
Expected Result: All occurrences of the substring are replaced.

Note that this functionality seems to be working if the "Down" direction is chosen.
Update: I would like to add that the issue is not only with Replace All. The same bug is happening with "Replace" with both "Up" and Down" directions.

The execution of the getContextMenuByTagName inside the oncontextmenu event of RadEditor hides the context menu once it is shown. This happens in Lightweight render mode only and when the UseRadContextMenu is enabled:

<telerik:RadEditor ID="RadEditor1" runat="server" ContentAreaMode="iframe" OnClientLoad="OnClientLoad">
    <Content>
        <table>
            <tr>
                <td>test</td>
            </tr>
                <tr>
                <td>test</td>
            </tr>
                <tr>
                <td>test</td>
            </tr>
        </table>
    </Content>
</telerik:RadEditor>
<script>
    function OnClientLoad(editor, args) {
        editor.attachEventHandler("oncontextmenu", function (e) {
            var oSelection = editor.getSelectedElement();

            setTimeout(function () {
                var tdMenu = editor.getContextMenuByTagName("TD"); //the call of getContextMenuByTagName closes the context menu when lightweight render mode is used. You can slow down the closing with the setTimeout function or by settign UseRadContextMenu to false.

            }, 1000);
        });

    }
</script>

"The size of the uploaded file exceeds max size allowed" is thrown even if the file is under the specified maximum upload file size.

The error is reproducible in the Default demo -> http://demos.telerik.com/aspnet-ajax/editor/examples/overview/defaultcs.aspx.

Open the Document manager and upload some unsupported file which size does not exceed 200 kb. For example upload a small image file. You'll get the following error:

The size of the uploaded file exceeds max size allowed.
The extension of the uploaded file is not valid. Please, provide a valid file!

while only this line should be shown: The extension of the uploaded file is not valid. Please, provide a valid file!

RadCalendar and RadDatePicker cannot pass the following check by https://achecker.ca/checker/index.php

WCAG 2.0 guideline
Section

1.3 Adaptable: Create content that can be presented in different ways (for example simpler layout) without losing information or structure.
Success Criteria 1.3.1 Info and Relationships (A) 

Check 245: Data table with more than one row/column of headers does not use id and headers attributes to identify cells.

Repair: Add id and headers attributes to table cells so they identify the cells that relate to the headers.

Error Line 597, Column 8:
<table id="ctl00_ContentPlaceholder1_RadDatePicker1_calendar_Top" class="rcMainTable" summary="Table …

Steps to reproduce

Go to https://achecker.ca/checker/index.php

Paste https://demos.telerik.com/aspnet-ajax/datepicker/accessibilityandinternationalization/wcag2.0andsection508accessibility/defaultcs.aspx
or 
https://demos.telerik.com/aspnet-ajax/calendar/accessibility-and-internationalization/wcag-2.0-and-section-508-accessibility/defaultcs.aspx

See the results -> 

Check 245: Data table with more than one row/column of headers does not use id and headers attributes to identify cells.
Repair: Add id and headers attributes to table cells so they identify the cells that relate to the headers.
Error Line 568, Column 8:
<table id="ctl00_ContentPlaceholder1_RadDatePicker1_calendar_Top" class="rcMainTable" summary="Table ...


=======================================

WORKAROUND:

$telerik.$("table.rcMainTable tbody th").each(function (idx, el) {
    var thId = $telerik.$(el).attr("id");
    $telerik.$(el).siblings("td").attr("header", thId);
})

There are more than 30 items (including task title) in RadGrid Task
I can't see Edit Template because my display resolution is not enough to show all Tasks.
I always get this problem with small resolution monitor.
Can you make it collapsible?
How do I go to EditTemplate? The task is not in the screen

http://screencast.com/t/CySy2iAoiG4n